Improvement in products and methods of coating and preserving metals



UNITED STATES PATENT CFFIGE.

ALBERT I. G. DAUMESNIL, OF PARIS, FRANCE.

IMPROVEMENT lN PRODUCTS AND METHODS OF COATING AND ERESERVING METALS.

Specification forming part of Letters Patent No. 208,674, dated October 8,1878; application filed May 20, 1878; patented in France, March 14, 1878.

To an whom it may concern:

Be it known that I, ALBERT PAUL GEORGES DAUMESNIL, of Paris, France, have invented Products and Methods for Coating and Proserving Metals; and I do hereby declare that the following is a full, clear, and exact descriptionof the same. My invention consists in new products designed for coating pieces of metal of any form and size, in the methods of using these products, and in their various applications.

. For-obtaining the product take about two i i-pounds of borate of lead and crush it in a mill--for instance, of the same arrangement as those used in .tl1e manufacture of Sevres for em blecolors. This crushing is operated with water, and sufliciently long to obtain the product greatly divided, and that it may readily be kept in suspense 1n the water without necessity to agitate it too often When the crushing has reached this stage the whole is collected in a vessel suflioiently large to contain aboutthrce and one-half pints of water, leav'in g it to settle, in order to take off the water having been used for the crushing. Then take four-tenthsonnce of ohloride-of-platina crystals, which is dissolved in one and three-fourths pint of distilled water. After complete dissolution four-fifths pint of ammonia in small quantities is poured on, this dis=" solution,and the whole is agitated thoroughly by means of a glass spatula. The platina, by the contact with the ammonia, precipitates as a brown matteggreatly divided. The precipitate is left to settle for three hours. Then the nmmoniacal wateris decanted, and pure water -substituted therefor. The whole is now agitated with the spatula, then left to subside a seisond time for three hours, and when again decanted, the platina thus obtained is mixed with the borato of lead. A-

In orderto mix the two products thoroughly the whole. is again put into the crushing-machine,- where it is mixed during half an hour at least; then add about eight and one-half pintsof water, when the product is. ready for composition, after having them sufliciently brushed or washed, the pieces of steel, castiron, copper, or other metals it; is desired to protect; then the pieces so steeped are placed in a muflle of sheet-iron strongly heated. The

fire is continued till the coating (from white as it was) has become the black dull color of iron. At this stage the operation is finished,-

and the pieces are withdrawn from the muffle; and left to cool.

It is to be well understood that I do not limit myself to the proportions, manipulation, and method of use above described.

The same results may be obtained by modi fying the quantities or proportions abovespecified of the borate of lead or of-theplati by substituting to the use of this latter-one of its con generics or metal of the same sectionas, for instance, palladium, osmium, iri dium, or others; but I have preferably spokenof the platina because its price is less.

My product, again, may be used by coating, by the aid of a brush, the large pieces of metal it might be difficult to immerse, and then throwing on this coatingthe flame of a jet of gas of a proper temperature. I

The horate of lead is likely to attack the metal submitted to the operation, to bring one part of it into fusion,and to assist, by this fusion, the mixing of the plating. with this metal. In this transformation the borax 'disappears partly, and there remains on the surface of the coated pieces only a mixture or an alloy of lead, platina, and metal to preserved, this alloy or mixture forming a pro:

,tecting covering or coating against oxidize-- -ment.

I claim- The composition herein described for coat.- ing metals, the same consisting of borate of lead, chloride-of-platina crystals, ammonia, and water, in substantially the proportions specified.

Witnesses:

' Row. M. Hoorun,

.use. r -In order to use the product, dip into, the

EUGENE Hiznnnr.

ne and 

